RiftGrate is reporting that Trion Worlds filed to trademark 'Reactor' back in December 2014. The trademark has been updated twice since then with 'security interests' recorded on March 25 and May 21 of this year.
We're unsure at this time what 'Reactor' could be. Is it a new game? An expansion? Some sort of platform like Glyph? We'll have to wait to find out, but you can be sure we're keeping an eye on it!